Electric heater.



PATENTED JUNE 18, 1907.

J. A. fiEARDoN. ELECTRIC HEATER. APPLICATION FILED FEB.ZB,1906.

[NVEJV-TOR 1 W1 T/VESSES:

A Tram/16 STATES PATENT OFFICE, T-IJAMES A. R ARDoN, or SEATTLE,WASHINGTON.

; ELECTRIC HEATER.

pave. 857.485.

Specification of Letters Patent.

Patented J une 18, 1907.

Application filed February 23.1906; Serial No. 303,492.

Electric Heater, of which the following is a Y specification.

This invention relates to electric heaters, and has for itsprincipalobject to rovidea .IO device of simple construction whic may beconveniently used for the heating of small uantlties of water in basinsort e like, or

or other purposes where an electric current may be conveniently employedfor heating purposes.

' A further object of the invention is to provide a resistance elementcarrier in the form of a helically grooved cylinder of porcelain orother non-conducting material, in which provision is made for theconvenient placing of a double winding of wire of high resistance, a

' further object in this connection being to so construct a roovedcylinder that while acting to prevent s ort circuiting of the coil, itwill,

2' 5 also, vshield the wire andprevent contact between the latter andthe casing of the heater.

' A still further object of the invention is to provide an electricheater which -may be placed in any liquid containing vessel withoutinterfering with the free circulation of water through the heater, nomatter what the position of the latter may be. i

A still further ob'ect of the invention is to provide anelectric eaterin which all of the 135 current conducting elements are held'fromcontactwith any portionof the exterior of the casing, so that there willbe no danger of shock in case 'a-portion of the body is immersedin thewater while the heater is in op- 4 ing of'the heater may be graspedwithout the slightest danger of grounding any portion of v ing a portionof the current through the body the current throu h the body.

With these an other objects in view, as

will more fully hereinafter a pear, the invention consists in certalnnove features of con-I struction and arrangement of parts, here-"inafter fully described, illustrated in the accompanying drawings, andparticularly pointed-out in the appended claims, it being understoodthat various changes ,in the form, proportions, size and minor detailsof the -structure may be made without departing from the spirit orsacrificing any of the advantages of the invention.

plan view of the cylinder. view of a portion of the cylinder showing theeration, and any portion of the handle or cas- In the accom anyingdraw1ngs2-Fi re 1 1s a sectional e evat on of an e ectric eaterconstructed 1n accordance with the invention. Fig. 2 is a detailelevation, on an enlarged scale, of the cylinder forcan'ying the Fig. 3is a sectional Fig. 4 is a detail reslstance element.

manner in which the big t of the resistance wire is held. Fig. 5 is asectional View of the handle on an enlarged scale. Fi 6 is a detail viewof a portion of the switci.

Similar numerals of reference are employed to indicate correspondingarts throughout the several figures of the raw 7o S 11 carrying out theinvention, a cylinder 10 is formed of porcelain or similar material,

and the periphery of this cylinder is provided with a pair of, helicalribs 11 that extend from end to endof the cylinder and define grooves inwhich the wire 12 is wound. At a point near one end of the cylinder oneof the ribs is cut away and provided with a notch 15 whichreceives thebent portion of the wire, and the latter is 'thence wound double throughthe grooves, each single turn being 'separated from the others by theribs until,

at the op osite end of the cylinder, the ribs are revidbd with openings16 for the passage of t e ends of the wire. The ribs are prefer-' ablyso spaced as to permit the ready winding of the wires within thegrooves, and are of such height that no portion of the wire will beexposed, the wires being-thus kept from 0 either mechanical orelectrical contact with the casing 18 in which the cylinder is laced.All portions of the electrical con uctors are thoroughly insulated andheld from con- 4 tact with the casing,so that the latter may 5 begrasped in the hand without danger of shock, and there can be no dangerof groundin case the hand is immersed inthe water while the heater is inoperatio'nl The casing 18 is annular in cross section, comprising anouter tube 18 and an inner tubev 19. This casing is hermetically sealedat both ends, and if necessary the, air may be exhausted therefrom.Theouter end of the casing is preferably rounded, although its shape atthis point is notof material: importance. From the endot thecaslngproect a number of lugs 20 whichserve to support the lower end ofthe casing slight y no to .the handle.

above the bottolnof the vessel in case the heater is placed in avertical position. This will permit of the circulation of the waterthrough theinner tube 19, no matter what the position of the heater maybe.

Secured to one end-of the casing is a pair of tubes 21, containing wires22 which are connected to the .ends of the high resistance wire, andsaid wires extend through the tubes The handle is made in two sections,23 and 24, the section 23 being provided with contacts 25 and 26 towhich the ends of the wire 22 are connected. This portion of the handlehas an end socket in which the outerportion of the handle may bescrewed, and the outer portion of the handle is provided with contacts27 and 28, that are arranged to engage with the contacts 25 and p 26,respectively.

' The outer section of the handle is connected to current conductingwires 29 and 30, which may be connected at the opposite end to asuitable plug for insertion in a lamp socket or the like, and in thisouter portion of the handle is a rotary push button switch 31 thatis'connectcd between the wire 29 and the contact 27,-while the wire 30is extended directly to the contact 2-8. The rotary push button switchis of thattype in which alternate depressions will make and break thecircuit, one depression closing the circuit in .order to place theheater in operation, and

the current continuing to flow through the high resistance wire untilthebutton is again depressed, thistime for the purpose of breaking thecircuit.

The outer section. of the handle may be removed at' pleasure, and whenso removed there are no live wire connectlonswhlch might prove dangerousin the event of careless handling, the apparatus being constructed witha view of preventing accidental shocks, while in the hands of carelessor inexperienced persons.

The device may be conveniently employed for the heating of smallquantities of water in basins or similar vessels, or may be used forheating purposes generally if desired.

1. 1n anelectric heater, a hollow cylindrical cylinder having on itsperiphery -a double rib extending helically from end to end of thecylinder, one of the ribs being providedwith' an under-cut recess at apoint near one end of the cylinder to receive the bight of the wire andprevent its accidental displacement, and.

both of the ribs having openings near the opposite end of the cylinder,and a double resistance wire, the bight of which extends throughtheundcr-cut recess, the wire be-- ing wound in the grooves between theribs and the terminals of the wire passing through said 0 I enings.

2. n an electric heater, acylinder of in sulating material having w rereceiving the cylinder is incloscd, a handle carryingsaid casing, andcurrent conducting wires ex:

tending through the handle and connected to the terminals of theresistance wire. I

3. In an electric heater, a grooved cylinder of insulating material, aresistance wire wound within. the grooves and having its two terminalsat the same end of the cylinder, a metallic casing inclosing thecylinder and including a pair of spaced tubes, the inner of which isopen at both ends to permit the passage of li uid, a bifurcated handlesecured to the cylinr er, and current conductors extend ing through thehandle and connected to the terminals of the resistance wire. 4. In anelectric heater, a cylindrical support formed of insulating material.and provided with peri heral grooves, a resistance wire wound wit llllthe grooves and having both of its terminals at the same end of thecylin.der,an annular casing inclosing said support, the grooves being ofsufficient depth to prevent contact between the wiresand the outerportion of the casing, a handle member, a pair of tubes connecting thehandle 'mem her to the casing, current conductors extend.- ing throughthe handle member and the tubes and connected to the terminals of theresistance wire, and a switch located in the handle.

5. In an electric heater, an annular casing 10d arranged to form acentral liquid passage, project-ions arranged atone end of the casing topermit free circulation of the li uid when the casing is placed on end,a hand e secured to the opposite end of the casing, and a high 105 cured.to one end 0 the casing, a high resist I10 ance conductor arrangedwithin and held from contact with all portions of the casing, currentconductors extending through the handle and connected to the highresistance conductor, and lugs or projections disposed at that end ofthe casing opposite the handle to permit the free circulation ofliquidwhen the heater is placed on end.

7. In an electric heater, the combination with aca'sing, of a highresistanceiconductor arranged within and held fromeleetrical contactwith the casing, a two part handle com prising, inner and outerdetachable sections, contact members carried by the sections andarranged to engage with each other to com 12 lete a circuit, acontrolling switch carried y the outer sect onof the handle, the outersection together with the switch and current conductors being detachablefrom the inner section.

- 8. In an electric-heater, a casing-Q11" high tion of the handle,togetherwith the switch resistance conductor arranged within and. andthe outer, current conductors" being deinsulated from said casing, asectional handle tachable fronlthe inner section of the handle. 1 forsaidcasing, said sections having plug and socket connection, and. theinner section having current conductors that are connected to the highresistance conductors, aswitch earried by the outer section of thehandle, and current.. conductors leading through such outer section, theswitch being connected to I :one of said current conductors the outersec- In testimony that I claim the foregoing as 15 my own, I have heretoaffixeci'my signature in the presence of two witnesses.

' JAMES A. -REARDON.-

Witnesses:

J. Ross COLHOUN. C. E. DOYLE.

